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The two blocks $A$ and $B$ of equal mass are initially in contact when released from rest on the inclined plane. The coefficients of friction between the inclined plane $A$ and $B$ are $\mu_1$ and $\mu_2$ respectively.
  • AIf $\mu_1 > \mu_2$, the blocks will always remain in contact.
  • BIf $\mu_1 < \mu_2$, the blocks will slide down with different accelerations. (if blocks slide) 
  • CIf $\mu_1 > \mu_2,$ the blocks will have a common acceleration $\frac{1}{2} (\mu_1+\mu_2) g \, sin \theta $.
  • DBoth $(A)$ and $(B)$
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